Would be impossible to remake as a Renpy. It is an open world non-linear game this only works as RPGM or HTML or QSP
Renpy only works for linear or semi-linear games but is really hard to nearly impossible to make open world games in it. Like a Renpy is best of course with a branching story but even a branching game in a Renpy is still linear you have to follow your way through the branches to see all the content
This is non-linear you can take events in any order you please (with some events tied to main story progression but the bulk of the events being set in the open world and can even be triggered before starting the main story). That's impossible to achieve in Renpy
Funny that you claim this game is non linear. Maybe a couple years back before they changed everything. But now the game is super linear, so much of the "Open World" is tied to doing main story content. ie the biggest one that comes to my mind is the Porn Studio, you literally have to go through a million hoops to access it now, where as years ago you could go there anytime you want, and there were actually some scenes to losing your virginity there. Now good luck getting there being a virgin if you even can and if there are any special scenes anymore, because you have to go through prostitution events to unlock it. This is only one example.
Imho what it feels like happened is the creator was getting tired of being called another Girl Life clone, and thus took the base game they had and then built a new game on top of it. Nothing inherently wrong with that, but it does mean that the game is vastly different than what it was years ago. And I also do hold the same opinion that this new game would be better served in Renpy or even another engine entirely.